I bought the Shure 81's(Love em) for my AKG 390's for outdoor, and i use the WS that came with the AKg's for Indoor. Personally, if i needed to buy a set for indoor, i would go with the DPA DUA0020's for Smoke and AC Vents/Fans. I would think the smoke wouldnt penatrate any WS, but would rather collect on the outside of it, so id go for the Smaller ones.
IMO.
I could be wrong.
-Rhys